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25 October 2007 Long-term monitoring of layering of lower atmosphere in urban environments by ceilometer
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Automatic monitoring of lower atmosphere layering was performed by continuous remote sensing measurements with ceilometer and sodar in Augsburg. The Vaisala ceilometers LD40 and CL31 were used which are eye-safe commercial lidar systems. Special software for these ceilometers provides routine retrievals of lower atmosphere layering from vertical profiles of laser backscatter data. A comparison was performed with parallel monitoring of the layering by acoustic remote sensing (sodar). From the acoustic and optical remote sensing data the following features are analysed. The sodar measurements provide the height of a turbulent layer characterized by high acoustic backscatter intensities due to thermal fluctuations and a high variance of the vertical velocity component. The ceilometer measurements add information about the range-dependent aerosol concentration; gradient minima within this profile mark the borders of mixed layers. Different examples of meteorological conditions will be discussed to demonstrate the possibilities of atmospheric layering retrieval.
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Klaus Schäfer, Stefan Emeis, Carsten Jahn, Christoph Münkel, Caroline Münsterer, and Ulas Im "Long-term monitoring of layering of lower atmosphere in urban environments by ceilometer", Proc. SPIE 6745, Remote Sensing of Clouds and the Atmosphere XII, 67450W (25 October 2007);

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